• Golang Cheat Sheet Pdf
• Rust Syntax Cheat Sheet

Go string handling overview cheat sheet 40+ essential string functions: literals, concatenation, equality, ordering, indexing, UTF-8, search, join, replace, split, trim, strip, lowercase/uppercase. Go Cheat Sheet Credits Most example code taken from A Tour of Go, which is an excellent introduction to Go. Golang cheat sheet programming language reference card. Golang Cheat Sheet by deleted - Cheatography.com Created Date: 3158Z. Golang Cheatsheet As I’m learning a new language, it’s a very useful exercise for me to summarize the essence of the language for future personal reference. Golang is an excellent language to learn, and instead of having to Google and juggling between Go’s Playground, StackOverflow, Golang’s Documentation, it’s a lot nicer to have my.

It’s a reverse dictionary of printing format of fmt package. It let you find the right verbs from desired output quickly.

the value in a default format	%v
type of the value	%T

+255	Always show sign	%+d
‘ÿ’	Single quoted	%q
377	Octal without leading '0’	%o
0377	Octal with leading '0’	%#o
ff	Hex lowercase	%x
FF	Hex uppercase	%X
0xff	Hex with “0x”	%#x
U+00FF	Unicode	%U
U+00FF 'ÿ’	Unicode with char	%#U
11111111	Binary	%b

| 1| | 12| | 123| | 1234| |12345| |123456| |1234567|	|1 | |12 | |123 | |1234 | |12345| |123456| |1234567|	Minimum width=5. Expand if wider.	%5d %-5d (Left justify)
| 1| | 12| | 123| | 1234| |12345| |12345| |12345|	|1 | |12 | |123 | |1234 | |12345| |12345| |12345|	Width=5. Truncate right if wider.	fmt.Printf(“%s”, fmt.Sprintf(“%5d”, value)[:5])) fmt.Printf(“%s”, fmt.Sprintf(“%-5d”, value)[:5])) (Left justify) or fmt.Printf(“|%5.5s|n”, strconv.Itoa(value)) fmt.Printf(“|%-5.5s|n”, strconv.Itoa(value)) (Left justify)
| 1| | 12| | 123| | 1234| |12345| |23456| |34567|	|1 | |12 | |123 | |1234 | |12345| |23456| |34567|	Width=5. Truncate left if wider.	fmt.Printf(“%5d”, val % 100000) fmt.Printf(“%-5d”, val % 100000) (Left justify)
|0012345|		Pad with '0’ (Right justify only)	%07d

original	%f (=%.6f) 6 digits after decimal	%e (=%.6e) 6 digits after decimal	%g smallest number of digits necessary

Data Types

Constant

value never changes, can be number, bool, or string

const s string = 'banana'

get type of data structure

import reflect
myVar := 'blah'
fmt.Println(reflect.TypeOf(myVar).String())

int8 (-128 to 127)
int16 (-32,768 to 32,767)
int32 (2,147,483,648 to 2,147,483,647)
int64 (-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807)
uint8, 16, 32, 64
float 32, 64

Structs (similar to Class)

type person struct {
name string
age int
}
func main() {
fmt.Println(person{'bob', 20}) ## {bob, 20}
s := person{'joe',35}
fmt.Println(s.name) ## joe
}

Array
var a [5]int
b := [5]int{1, 2, 3, 4, 5}
fmt.Println('array is:', b)


double array

Hashes / Dictionary (Map)

Slice (Dynamic Array)

primes := [6]int{2,3,5,7,11,13} #array of prime numbers
var s []int = primes[1:4] # slice of prime array, values are from 1 to 4 index
var s []int = primes[:4] # slice, values from 0 to 4 index
len(s) # length of slice
cap(s) # max length of slice
Map - like a python Dictionary

JSON

read in a struct, generate a pretty print JSON

Golang Cheat Sheet Pdf

Conditionals

For Loop
if / Else
Switch Case
Functions
}## 1+2 = 3
multiple-value return function

Goto

Parameters

package main
import (
'flag'
'fmt'
)
var name = flag.String('name', 'world', 'some name')
// var name, default value, description of param
func main() {
flag.Parse() //turn params into vars
fmt.Printf('hello %s', *name)
}

Rust Syntax Cheat Sheet